1	"Plants non-green, parasitic, without leaves"	Cuscuta
1	"Plants green, photosynthetic, with leaves"	2
2	"Styles 2, free or united only at base"	3
2	"Style 1"	4
3	"Ovary not lobed; leaf elliptic; plant tufted"	"Cressa {Cressa truxillensis}"
3	"Ovary shallowly to deeply 2-lobed; leaf reniform; plant matted"	Dichondra
4	"Stigma unlobed, head-like"	Ipomoea
4	"Stigma lobes 2, oblong to linear"	5
5	"Stigma lobes oblong, tips obtuse; calyx 7--25 mm; corolla 20--75 mm"	Calystegia
5	"Stigma lobes linear to narrowly spoon-shaped, tips acute; calyx 3--10 mm; corolla <= 40 mm"	Convolvulus